linux-kernel - [PATCH v6 10/14] KVM: s390: Refactor absolute vm mem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230125212608.1860251-11-scgl@linux.ibm.com>
Date:   Wed, 25 Jan 2023 22:26:04 +0100
From:   Janis Schoetterl-Glausch <scgl@...ux.ibm.com>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     Janis Schoetterl-Glausch <scgl@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Jonathan Corbet <corbet@....net>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-s390@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: [PATCH v6 10/14] KVM: s390: Refactor absolute vm mem_op function

Remove code duplication with regards to the CHECK_ONLY flag.
Decrease the number of indents.
No functional change indented.

Suggested-by: Janosch Frank <frankja@...ux.ibm.com>
Signed-off-by: Janis Schoetterl-Glausch <scgl@...ux.ibm.com>
---


Cosmetic only, can be dropped.


 arch/s390/kvm/kvm-s390.c | 43 ++++++++++++++++------------------------
 1 file changed, 17 insertions(+), 26 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 588cf70dc81e..cfd09cb43ef6 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2794,6 +2794,7 @@ static void *mem_op_alloc_buf(struct kvm_s390_mem_op *mop)
 static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 {
 	void __user *uaddr = (void __user *)mop->buf;
+	enum gacc_mode acc_mode;
 	void *tmpbuf = NULL;
 	int r, srcu_idx;
 
@@ -2813,33 +2814,23 @@ static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 		goto out_unlock;
 	}
 
-	switch (mop->op) {
-	case KVM_S390_MEMOP_ABSOLUTE_READ: {
-		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
-			r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_FETCH, mop->key);
-		} else {
-			r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
-						      mop->size, GACC_FETCH, mop->key);
-			if (r == 0) {
-				if (copy_to_user(uaddr, tmpbuf, mop->size))
-					r = -EFAULT;
-			}
-		}
-		break;
-	}
-	case KVM_S390_MEMOP_ABSOLUTE_WRITE: {
-		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
-			r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_STORE, mop->key);
-		} else {
-			if (copy_from_user(tmpbuf, uaddr, mop->size)) {
-				r = -EFAULT;
-				break;
-			}
-			r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
-						      mop->size, GACC_STORE, mop->key);
+	acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE;
+	if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+		r = check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key);
+	} else if (acc_mode == GACC_FETCH) {
+		r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
+					      mop->size, GACC_FETCH, mop->key);
+		if (r)
+			goto out_unlock;
+		if (copy_to_user(uaddr, tmpbuf, mop->size))
+			r = -EFAULT;
+	} else {
+		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
+			r = -EFAULT;
+			goto out_unlock;
 		}
-		break;
-	}
+		r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
+					      mop->size, GACC_STORE, mop->key);
 	}
 
 out_unlock:
-- 
2.34.1